The assessment of visual physiology has been done for several years with different technologies and tools that vary significantly in cost and accuracy. One of the most studied measures in this field is visual acuity since this is essential in ophthalmological examination with an eminent relevance in the diagnosis of pathologies, legal medical decisions and clinical research processes, and basic sciences. Visual evoked potentials make it possible to reduce the subjectivity of visual acuity tests. Achieving the repeatability of these methods with portable and low-cost equipment is a challenge that has been developed and for which the need for a tool is established that allows speeding up the acquisition process under visual stimulation accompanied by an environment protocol. The tool developed in this project allows to record of the visual potentials in a steady state and to visualize of the signals in real-time with a portable tool, a friendly interface, with a simple, efficient, and affordable assembly protocol. In addition, it delivers the maximum power values in a frequency range limited by the stimulation frequency, in each of the presented acuity levels, and the exact frequency in which this maximum peak occurred, additionally, it allows to visualization of previously registered signals. Another important result is the time-frequency image that allows us to observe at a general level the behavior of frequencies over time, this image is commonly used in signal analysis with machine learning methods.